I am an self-employed iOS developer and so have my own iOS distribution membership.
For a few days, I am working as a developer in a team. My apple account has been a
You may also need the appropriate certificate. without the need to have full access to certifications or to be full admin
you can email the creator of the signing certificate. Ask the creator to export the signing certificate on their Mac so you can install it on your Mac.
Please see the link below for more information:
https://help.apple.com/xcode/mac/current/#/dev3a05256b8
https://help.apple.com/xcode/mac/current/#/dev154b28f09