won’t let me send messages or receive messages

Review the instructions in this guide published by Apple 👉 If you can't send or receive messages on your iPhone or iPad - Apple Support

Axel F.

marysol36 Said:

"Why can’t I send messages or receive them even after I try to put in my Apple ID in ?"

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What type of messages? eMail? or Text? Seems you mean iCloud eMail address. If so, refer to the flowing...

Troubleshooting iCloud eMail:

Go Here: Set Up a Primary iCloud Mail address - Apple Support