iMessenger does not work on MacBook Pro
iMessenger on my MacBook Pro will not send or receive messages except sporadically. I cannot figure out why it goes in and out. Currently, it has stopped working again.
No, I have not deleted or reinstalled iMessenger. Yes, I have looked in the Keychain access for "Messenger," "iMessenger," and "Apple Messenger" and I cannot find anything under any of these names. (Problem?) Yes, I am signed in to my iPhone and my MacBook Pro with the same Apple ID. Yes, my MacBook Pro and iPhone 12 are both updated (currently, to IOS 18.0.1 on the iPhone and to Sequoia 15.0.1).
MacBook Pro 13″, macOS 15.0