[com.enflick.android.TextNow] TextNow - Fails to log into account June 2023

Affected app
Name: TextNow: Call + Text Unlimited
Package id: com.enflick.android.TextNow

Describe the bug
TextNow fails to login, On the login page for an existing account, entering the Email address, and Password results in an error message that reads: "An error has occurred. We are having trouble accessing your account. Please try again."

To Reproduce
Steps to reproduce the behavior:

1. Launch TextNow
2. Click on "Already have an account? Log In"
3. Select Log In with Email
4. Enter email, password, and accept terms, then click "Log In"
5. Fails to login and displays the error message "An error has occurred. We are having trouble accessing your account. Please try again."

Expected behavior
A successful login should occur

System
Android Version: 13
Custom ROM: CalyxOSOS 4.10.1

microG
microG Core version: 0.2.27.223616-39 (9803dc4)
microG Self-Check results: All ticked, except for "Permission to This app can appear on top of other apps"
I also added the permission so that TextNow could appear on top of other apps, and I am receiving the same exact error

Start by reviewing the Android authentication paths in microG and reproduce the TextNow email-login failure on Android 13 with the reported configuration. The issue provides no source file or test entry point; done would mean identifying the compatibility failure and confirming that TextNow can log in successfully.