Are voting rights protected as part of the Withdrawal Agreement?
No. Our local election voting rights are currently being negotiated bilaterally. The only agreements the UK has reached so far are with Portugal, Luxembourg, Spain and Poland. At the3million we are campaigning to preserve local election voting and candidacy rights. You can read more about our campaign here: https://www.the3million.org.uk/let-us-vote-campaign
However, Wales and Scotland have granted local election voting rights to all foreign nationals with leave to remain. As for England and Northern Ireland, it has been confirmed (see this Parliamentary Question) that EU citizens will have the right to vote and stand as candidates in the May 2021 local elections.