TypeError in getRootMicrosoftGraphUri

[Loki3000]

Hi there!

        $openIdConfiguration = $this->getOpenIdConfiguration($tenant, $version);
        return 'https://' . $openIdConfiguration['msgraph_host'];

After an unsuccessful attempt to get the configuration, getOpenIdConfiguration returns an empty string.
As a result, the next line triggers a TypeError. It's not an exception, so it isn't caught by other error handlers.

[decomplexity]

The statement is correct (is in use here every day) - so it is worth checking your $tenant and $version

[Loki3000]

Possible return types of getOpenIdConfiguration is array|string (string in case of BadResponseException)
in case of string statement $openIdConfiguration['msgraph_host'] is not correct