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Fyi, this is currently possible: https://uk.wavenetuk.com/knowledge-library/unified-communications-and-voice/the-best-features-of-microsoft-teams-mobile-app#:~:text=Call%20Handoff,your%20day%20wherever%20you%20are
See call handoff. I tested and can verify this works. Not intuitive, but just transfer the call to yourself and you can pickup on another device signed into Teams.