I have similar issue, but it's a private app. It was already released and in 'Ready for Sale' status months ago. Existing ABM orgs still have access. It's been placed in 'Ready for Distribution' status for weeks/months. The release option is disabled. The first new ABM org since has just reached out because they are having trouble accessing it. There are no warnings, or unaccepted agreements pending in App Store Connect.
EDIT:
New status just appeared:
Developers must provide their trader status to submit new apps or app updates for distribution in the European Union (EU)
We do not distribute to EU ( only US & Canada). Does this apply to our app?
UPDATE:
I acknowledged that we are not a Trader and not distributing to EU.
Release option still disabled. Should I assume this was in the way, and it's still processing?
EDIT:
Under pricing & availability the app is still listed as
...available in all future App Store countries or regions.
Is this a problem? Updating the setting requires 24hrs to process, and obviously we wouldn't want to delay org access unnecessarily.