I am also facing the same issue in my trigger.I checked properly and I have full access in the shared mailbox, but still receiving this error. I even waited for 2 days now.
Should i just delete the flow and create it again.
Reasons:
Blacklisted phrase (1): I am also facing the same issue
Blacklisted phrase (1): days now
Low length (0.5):
No code block (0.5):
Me too answer (2.5): I am also facing the same issue