WordPress app not accessing site any more

Hello

I use the wordpress app, for my site https://tassie.fish
It was all good until recently and posts would not upload.
I uninstalled the app, and now I receive an error stating that the site is not wordpress.

I am following the help here and in other posts but no luck as yet

https://apps.wordpress.com/support/mobile/login-signup/unable-to-read-the-wordpress-site-on-that-url-error-message/

The url is correct.
Check is good at W3C Markup Validator
1st check is good at https://xmlrpcvalidator.blog/

Deep check with credentials fails on first check: wordpress version. Version is 6.0.2. I also tried reinstalling wordpress.

Site can not be reached at: https://tassie.fish/xmlrpc.php?rsd
But the help does not tell me how to fix this.

I have tried:
A default theme
Disabling all plugins
Installed the plugin manage XML RPC to disable and enable
Wordpress and all plugins are up to date
Jetpack is installed

But unfortunately, the problem persists. Any suggestions?

The page I need help with: [log in to see the link]