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
For those who live in 2020 but are simply lost, here is where the "Team" button moved ! You’ll simply find it under the section “Signing and Capabilities” instead of “Main”. See the image below:

Xcode does not see your development team(is not a personal team) until admin check in the next setting in AppStoreConnect even if your role is Developer
Access to Certificates, Identifiers & Profiles