It is indeed. However this is an account issue rather than a support issue. For this you would contact accounts and billing.
There isnt anything more I can add to this on a support basis. This has been stated in the EULA and been policy for quite a long time now.
Unfortuanetly your site is just sitting on "Checking if the site connection is secure" and not allowing us past that point. Please could you disable this while we are checking the issue.
Note however, this is not related to "Questions" forums. Its related to the ability to mark items solved, which is separate to that which you show on your screenshot
This would indeed need doing with a cnames record. (2 in fact). We cannot do this via A record unfortunately. If you would like us to go ahead with this, I can get a ticket created for you in order to get details for your site specifically?
You would need to try the above first and foremost. If you are unsure on how to do this, your hosting company should be able to assist you with creating the file.
Please try using recovery mode, and also checking your server error logs to see what is showing up there
https://invisioncommunity.com/4guides/client-services/getting-support-r292/#recoverymode
Please use recovery mode to disable all 3rd party items. Its very likely one of those is not compatible with your site
https://invisioncommunity.com/4guides/client-services/getting-support-r292/#recoverymode
Not unless you have issues on your server with PHP8, no. Check you dont have anything which is throwing constant errors on your system by looking at the system logs in your System logs.
The reality is, it's the same site you are loading, from the same source, in both instances. The only difference here is the medium you are using to connect. The issue unfortunately can only really be on the phone side of things
Please upload a fresh set of files from your client area, then run the upgrade from /admin/upgrade . Let us know if this works for you and if not let us know here right away and we can get it sorted for you
There does seem to be an immediate assumption the issue is with the software there. I would suggest first of all switching to php 8, and then running the requirement checker, as mentioned above. You can find this in the following location
https://invisioncommunity.com/files/file/7046-invision-community-requirements-checker/