iMessage not working after sharing photos or documents
I cannot send iMessages anymore and get error saying that for sending to an e-mail address iMessage must be activated. However, iMessage is activated and worked fine until recently. I have only linked my iMessage with my email not with my phone numbers (in order to avoid unintensional sending as SMS). That was never a problem.
Since a couple of days it seems that iMessage stops working if I try to share a picture from photos or a document. In the message field "iMessage" is still indicated so both me and the recipient should still be ok. With one address I was later able to use iMessage again after I have received an iMessage from the other side that was sent from a Mac.
I cannot 100% confirm but it seems this error came up after updating to iOS 18.4
iPhone 14 Pro, iOS 18