Press reports seem to indicate that the Kawthoung (Myanmar) - Ranong border crossing is now open for foreigners using passports.
For a while it’s been open for those holding temporary border passes but not for those using passports.
The Andaman Club crossing remains closed.
If anyone is up that way and would care to confirm that would be appreciated.
TLDR : Answer Summary
Recent reports confirm that the Kawthoung (Myanmar) - Ranong border crossing is now open for foreigners traveling with passports. Previously, it was only accessible to those holding temporary border passes. A user also confirmed that vaccination proof is required or alternatively, visitors can pay for a COVID-19 test at the crossing. There are inquiries regarding whether entry to Myanmar is permitted if one holds a Burmese visa.