MS will deprecate the use of login.microsoftonline.com for Azure AD B2C tenants. There is now a hard stop date from Microsoft (ref. https://azure.microsoft.com/en-us/updates/update-apps-using-azure-ad-b2c-to-new-redirect-b2clogincom/). This means that if you have not changed to login.veracity.com within August 31st, 2022, login to your service will no longer work!
Please also make sure you check any libraries in the code for the same. If you use the Veracity Identity Nuget packages, please make sure you use Version 3.5.1.
More information:
https://developer.veracity.com/docs/section/identity/new-login-url