Lost my iMessage when moving from Catalina to Monterey
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I'm transitioning from my MacPro 5,1 running DosDudes Catalina (to many bugs), to my Mac Pro 6,1 running Monterey 12.7. But I've lost my iMessage Blue Messages icon(That I use everyday and now all I have is this green icon messages that I have used in the past to contact non-Apple people. I've lost all my people links and conversations. Tried drag and drop with the old App and it crashes on start up. I still get my Apple messages on my iPhone but I use my Mac much more than my phone. I'm not a happy camper, any advice?