It only shows this error if you are not logged in as admin. Normal users can not register.
This is related to caching on your site. If you have already tried to turn off caching from your end, then please ask your web host to re-locate your site to another server that does not force caching.
When I asked bluehost about removing caching they said the following.
That would have to be addressed with the developer of that tool. There is not a way to selectivly turn of that caching to this tool to go through it . It is all or nothing with varnish.
An error has occurred:
We’re sorry, but you do not have the required permissions to perform the following action: Create New Registration
You can update to the current version of EE4 (4.9.6) and that will fix the error you are seeing.
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