Hi @Oscar Assunção Alfredo Filho Thank you for reaching out to us, As I understand you are trying to access Identity provider section within Azure AD B2C.
Researched on this issue, to access Identity providers section, you need to have External Identity Provider Administrator Role, same has been documented here - https://learn.microsoft.com/en-us/azure/active-directory-b2c/roles-resource-access-control
Would request you to provide user the access of External Identity Provider Administrator role and verify the issue.
Let me know if you have any further questions, feel free to post back.
Please remember to "Accept Answer" if answer helped, so that others in the community facing similar issues can easily find the solution.