Invalid sender address from ipad

[Mbmb14]

Hi messages from my iPad to users now fail with invalid sender ID but if I send the same message from my iPhone the message sends with no issues. Checking the set up on both they are the same. I am a BT broadband user.

[Linzi_H]

Hi @Mbmb14 

Welcome to the community.

So we can help best, is this emails or iMessages you're struggling to send from your iPad? 
Are you able to receive messages on your iPad successfully?
Are you using a third-party app, logging into the BT app, or using a web browser?

Speak soon,
Linzi