I’m creating a new subscriptions with my current logged in user, but I’m getting error:

I’m creating a new subscriptions with my current logged in user, but I’m getting error:

I’m creating a new subscriptions with my current logged in user, but I’m getting error:

I’m creating a new subscriptions with my current logged in user, but I’m getting error:

I’m creating a new subscriptions with my current logged in user, but I’m getting error:

I’m creating a new subscriptions with my current logged in user, but I’m getting error:

I’m creating a new subscriptions with my current logged in user, but I’m getting error:

I’m basically trying to write a C# application to send a push notification to Microsoft Authenticator app something like 2FA authentication.
The user will need to confirm via his/her phone by typing the number shown.