Part of my job is to give feedback to people using Word Comments. Using STT, it's been a breeze. The time saving really is great. Thing is, I only do this when working at home with no one around. So really only when WFH.

Exactly. The consent was provided for the specific processing, not the TLD. The processing and all of those that are not incompatible with it, that it asked permission for that furthermore adhere to the requirements imposed regarding specific and informed consent in the GDPR (see Article 4, sub 11 GDPR and article 7 GDPR.