Wait one pronoun? But cis people are typically he/him or she/her each of those groups have 2. Strictly following that rule only people allowed should be "any" or "gender fluid" right?
I get this is horrible and hateful but I would totally go nuclear strict compliance. The person most likely meant "you can only ask to be referred to by one set of pronouns" but he said "one pronoun".
"I made a picture for my mother and she liked it".. Banned she and it are both pronouns. "He taught me that feature" banned he and that are pronouns. "we are reviewing this bug report" banned we and this are pronouns.
Even more awkward if you work from home