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I tried to create a new tag, related to part 2 of my question, m2-01al.
I typoed it and the correct name is m2-a01l or uppercase if it fits.
Possibility to rename? I don't edit tag privileges yet
There's only one question with that tag. Simply remove the incorrect tag and create the correct one from that question. Unused tags are pruned from the system once per day.
Do note that tags are always all lowercase.