CRM Connection String for Azure AD B2B Accounts

Hi there,

we have a few environments where we are invited as users by Azure AD B2B connect (See [1] and [2]). We have no troubles to access the crm instances in the browser. However, we currently find no working connection string to connect to such an environment, without using a local user for the login. We more or less tried all combinations for the username (our local one or the invited user upn in form of username_localdomain#EXT#@customer.onmicrosoft.com).

Does anyone have a working example for this scenario or some other helpful hints? This article https://docs.microsoft.com/en-us/dynamics365/customer-engagement/developer/xrm-tooling/use-connection-strings-xrm-tooling-connect does not contain any further helpful insights.

Regards,

Christoph

[1]: https://docs.microsoft.com/en-us/dynamics365/customer-engagement/admin/invite-users-azure-active-directory-b2b-collaboration
[2]: https://community.dynamics.com/365/projectserviceautomation/b/daytodaydynamics365/archive/2018/02/12/inviting-guest-users-to-dynamics-365-with-azure-active-directory-b2b-collaboration