Spotify:
iGroove is a Gold Partner of Spotify — this gives you direct access to Spotify for Artists.
Go to “Tools → S4A Access” in your iGroove account.
If you want to verify your profile before your first release (e.g., for pitching), you can use your artist URI.
Apple Music:
Verification is possible once at least one release is live.
You can manage your profile at: artists.apple.com
Amazon Music:
Profile management is available after registering at: artists.amazonmusic.com
Deezer:
With Deezer for Creators, you can edit your profile yourself.
More info: creators.deezer.com
SoundCloud:
Profile management: artists.soundcloud.com
Verification can be requested in your account settings via “Request Verification.”
TIDAL:
Profile adjustments can be made in TIDAL Artist Home: tidal.com/forartists