thanks to all those who tried to help. I was able to rule out many options by disabling all plugins, cloudflare etc. but the problem persisted.
The root cause turned out to be my own configuration on my host (Kinsta) when adding the SSL cert from LetsEncrypt.
I had bound the certificate to https://pokerdiy.com and not also to http://www.pokerdiy.com.
As soon as I bound it to both then the redirect error disappears.
Thanks to Kinsta’s great tech support for helping me find the root cause, I don’t think I would have spotted it otherwise…
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