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83639273 Dude, I've been struggling for months, trying everything, and this is the ONLY thing that worked. Thank you!! Texting some of my iPhone buddies with RCS chats feels surreal, never would have imagined it just a couple years ago.
FYI for anyone reading this: If its not working, download the Google app and give it the same permissions, including device identifiers. Initially OP's method didn't work, but this fixed it for me.
Really sucks Google has made RCS "theirs", but if that's what it takes to get it adopted, oh well... We all know phone carriers don't give enough of a shit to create proper RCS infrastructure