Error here:

Attempt 3 of 3
Fetching origin/refs/branch-heads/3029...
Cherry-picking commit on top of latest refs/branch-heads/3029
To https://chromium.googlesource.com/chromium/src.git
!	HEAD:refs/branch-heads/3029	[remote rejected] (prohibited by Gerrit: ref update access denied)
Done

The command I ran:
git drover --branch 3029 --cherry-pick 0b5c13253a5c567373cf037d336a998601105082

The command that the script is trying to run:
Failed to push. If this persists, please file a bug.
Error: Command 'cl land --bypass-hooks' failed: Command '['git', 'cl', 'land', '--bypass-hooks']' returned non-zero exit status 1

My guess is that this is due to using your @google account to authenticate to Gerrit, while only your @chromium account was including in committers@chromium.org. I've linked your accounts, and now your @google account should be recognized as having the same permissions, namely, to push to release branches.

Please re-open if you still have trouble, or verify if this works now. Thanks!

Thanks for marking it fixed.