Meta Box will not display

Try chaining the action hook for first function from:

add_action( 'admin_menu', 'true_add_a_metabox' );

to below:

add_action( 'add_meta_boxes', 'true_add_a_metabox' );

Also make sure that ‘Forum Discussion URL’ under ‘Screen options’ is checked to ensure it displays on edit post screen 🙂

Related Posts:

  1. How to HIDE everything in PUBLISH metabox except Move to Trash & PUBLISH button
  2. Removing panels (meta boxes) in the Block Editor
  3. How can I create a taxonomy meta-box with search suggestions but no new terms input?
  4. How to Add Reminders/Notes to New Post Meta Boxes
  5. How to reorder meta box position?
  6. Put the media uploader in a metabox
  7. Custom Meta Boxes: multiple fields within a repeatable field
  8. How to group meta boxes on the post edit page
  9. Metabox date month number to word
  10. get registered metaboxes by post type or post ID
  11. Remove metabox from specific page template in admin
  12. Is there a filter/action to add content to WP admin metaboxes?
  13. Attach Files Metabox
  14. How do I create a meta box for dates?
  15. esc before saving or before displaying does it matter?
  16. Add a meta description to home page?
  17. how to sanitize checkbox input?
  18. Set height of the categories meta box in post dashboard
  19. Add template meta box to category edit page?
  20. Get image captions for images on gallery post format metabox
  21. Adding Metaboxes – so much code is there a shorter DRY way?
  22. Consolidate Metaboxes into 1 Big Metabox
  23. I need a Simple image uploader with a simple screen. WP default has too many options.
  24. Show or hide custom meta box not work with Gutenberg
  25. TinyMCE with custom buttons on a meta box
  26. How do i hide the auto-generated custom field that’s created when update_post_meta() is called?
  27. Set the default value as checked for a meta box checkbox
  28. How to search by metadata using REST API
  29. Display oembed in repeatable metaboxs using CMB2
  30. Automatically add a tag according to custom metadata
  31. How to add categories to page editor?
  32. Having trouble getting my meta data to save
  33. Display meta box on front end
  34. Show how many images are attached to a post/page on compose page
  35. Metabox context for page post type
  36. How to use MarkDown in a custom textarea field?
  37. Populate meta select box with child pages
  38. Problem with meta box in Links
  39. Post Meta not saving when have empty post
  40. Remove ShareDaddy meta box from Pages only
  41. On click hide group of metabox, similar to screen options checkbox?
  42. How to make a stand-alone button to the post edit view
  43. Custom Meta box only returns most recent value on page
  44. Display Term Metabox Only On Certain Term Edit and Add Pages In Admin
  45. How to prevent further updates of custom meta when using actions to set one meta based on another
  46. Stop saving process when metabox is invalid [duplicate]
  47. how can i do metabox [closed]
  48. How to add meta box for image upload using WordPress media uploader?
  49. why add_menu_page use simple function as arg while add_meta_box a call back?
  50. List all sidebars in metabox
  51. Output from Meta Box Array
  52. How to show the value of specific key from nested array?
  53. Parse a text area custom meta box and assign as value to existing meta keys
  54. WordPress global variables?
  55. Getting metabox value?
  56. I have added a metabox and inside it i added a secondary title and a text editor but if i write anything it does not save it or show it on my page
  57. Hide Page Title with Post Meta
  58. How many meta-query fields support WordPress search at a time?
  59. Cannot remove meta box added through OOP
  60. Meta box does not save or update
  61. WP admin display custom field if another field value is “Female”
  62. Show button if meta box has content, else hide
  63. Post Excerpt field only showing for default administrator
  64. Is ‘repeatable’ a field type for meta boxes?
  65. Checkbox in post not saving value
  66. Custom loop attached to link
  67. post meta – problem : copy the same meta for all the articles
  68. ACF – Hiding metaboxes through screen settings doesn’t work
  69. Remove Username and just show Name in Author Metabox in backend
  70. how can I make this metabox area
  71. get_post_meta giving errors while creating a metabox
  72. how to Add Meta Box with featured image settings and To Edit Post Screen For Inline Styles (css box)?
  73. Metabox not saving values
  74. Update Post Meta in Front End with a form
  75. get_post_meta not working on my custom-function page
  76. Metabox with checkbox is not working true!
  77. Featured Gallery to custom post type
  78. Displaying a Metabox linked to post settings for all users
  79. Can’t get meta values to save
  80. Unable to save multiple images in wordpress
  81. Custom WP Meta Box – Use data from within the post screen inside meta box
  82. How Add a Save Button to Custom Meta Box without Leave/Stay js Dialog?
  83. How to show select_advanced content instead of ID?
  84. Removing Meta Generator
  85. Error when adding Meta Boxes, but only when adding 3 with the same callback
  86. Using Meta Boxes in a Custom Page Template
  87. A correct hook for saving meta boxes data
  88. update_post_meta does not work
  89. Hooking into the Meta Boxes (Name/Web Address/Description) on the ‘Add New Link’ Page
  90. Custom carousel with meta box data
  91. show title if one of post meta exist
  92. Query a Custom Post Type to another CPT via Metabox
  93. when saveing $meta_box i get Undefined index error
  94. Adding a Custom ‘Now’ button under ‘Published on’ header to return current date and time
  95. Adding meta boxes to custom post type
  96. Meta boxes not showing up
  97. Custom metabox with App Store / Google Play links
  98. How do I create a Meta box that can be repeated? (with an image section and text area)
  99. Need help, Passing variables with get_post_meta
  100. My meta box don’t want to save value