ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC8cBZzV5gblDfbi41AxXC3fmfP8w1okfdNn9b6uXaj7i03NwhJ0n4Eg8Z+zgAtyrIa2bw9tzF8fyeYsnRbK5Paj059dn+XiXp3HOgcvHO9jy9C1+nomkRCM55fkMSGyiSByh2KSOiqqAusrTV9joig/Re30gYpxm8iCs20gbD717lZTT0A3dnrv7IQ86nbn9+5h+yMcok/AWEWS6Xq1NJGG5vav+vh+Nhlteo72qj77B/DFK1noUxcTgcy27xZOp1wrr7a6PaBu6wEMgKd2Oe9wQtzycaOYTAywHqtXnOE/w7FvhJen20GqtL9k4Zr94hxUNG7LJoiO6gNzo/0q24t git@theo.gitlab.com
Using the key they placed on my Bitbucket repo worked on one of my Github repos.
EDIT: Turns out that key doesn't work. How can I make them add a key to my BitBucket account? I don't see an option for that...