[crossroadsguy]

Anybody on any macOS > Catalina? Can you still delete/select multiple messages in Messages app the way you can do on iPhone? Because I can’t on Catalina.

Do the deleted messages on one device syncs and gets deleted on another? No luck here as well. Support replied saying “they’ve checked and their systems are working fine and they can’t do anything about it more”.

[AnonHP]

This may not help, but here goes. Deleting SMS messages on one device never gets synced to another device for me. I rarely use iMessage, but I expect SMS to also be handled the same way (since I have SMS forwarding setup and get the same messages on multiple devices, with all of them tied to a single Apple ID).