I recently updated my iPhone, Mac, and iPad to OS 27.0, and after doing that, I have not been able to send or view text messages from my Mac and iPad. I can send and receive them just fine from my iPhone, and I can view text messages that were sent to me on my other devices, but not send. iMessage functionality is operational across devices.
I have already ensured that text message forwarding is enabled on my iPhone for both Mac and iPad, and I have tried disabling Messages in iCloud on all three devices and restarting them, but I still cannot send text messages on either Mac or iPad.