1. PHP 8.2.6; Phorge at `4d1adf69392a230075b8a4799058821d11cab16d`
2. As an admin user, go to http://phorge.localhost/auth/mfa/
3. Select
{nav icon=plus
, name=Add MFA Provider
} in upper right corner
4. In the `Choose Provider Type` overlay dialog, select option `Mobile Phone App (TOTP)`
5. On http://phorge.localhost/auth/mfa/edit/?providerFactorKey=totp , enter no `Name` and select `Create MFA Provider` button
```
[2023-05-12 16:43:31] EXCEPTION: (RuntimeException) strlen(): Passing null to parameter #1 ($string) of type string is deprecated at [<arcanist>/src/error/PhutilErrorHandler.php:261]
arcanist(head=renderDashboardTabPanelContent, ref.master=d47289622650, ref.renderDashboardTabPanelContent=d47289622650), phorge(head=master, ref.master=4d1adf69392a)
#0 <#2> PhutilErrorHandler::handleError(integer, string, string, integer) called at [<phorge>/src/applications/auth/controller/mfa/PhabricatorAuthFactorProviderViewController.php:86]
#1 <#2> PhabricatorAuthFactorProviderViewController::buildPropertiesView(PhabricatorAuthFactorProvider) called at [<phorge>/src/applications/auth/controller/mfa/PhabricatorAuthFactorProviderViewController.php:25]
#2 <#2> PhabricatorAuthFactorProviderViewController::handleRequest(AphrontRequest) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:284]
#3 phlog(RuntimeException) called at [<phorge>/src/aphront/handler/PhabricatorDefaultRequestExceptionHandler.php:41]
#4 PhabricatorDefaultRequestExceptionHandler::handleRequestThrowable(AphrontRequest, RuntimeException) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:751]
#5 AphrontApplicationConfiguration::handleThrowable(RuntimeException) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:296]
#6 AphrontApplicationConfiguration::processRequest(AphrontRequest, PhutilDeferredLog, AphrontPHPHTTPSink, MultimeterControl) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:203]
#7 AphrontApplicationConfiguration::runHTTPRequest(AphrontPHPHTTPSink) called at [<phorge>/webroot/index.php:35]
```
Fix that exception; afterwards page `Mobile Phone App (TOTP)` at http://phorge.localhost/auth/mfa/4/ renders in web browser.