Unable to save configuration form / API Key

I think it would make sense to add a test for the settings form and a general setup test here. We'll create a MR for that.

Please give more details about this. Which Drupal version do you use?

• Drupal 10.3.6
• PHP 8.3.13

I already had a look at the form - there's nothing special, so I think it might be the route subscriber, that's getting active once trying to save the API key?

I believe that exception you got is not related the TinyPNG module's route subscriber.

I'm trying to reproduce with a clean Drupal 10.3.6 installation and I cannot reproduce this. What was the original exception that the AuthenticationSubscriber caught?

Thanks, yeah we'll provide a test to check that, thanks. Really weird issue. Reducing priority till that!

Sorry, we switched to https://www.drupal.org/project/imageapi_optimize_tinypng → instead. Feel free to reopen if someone else runs into this. Thanks!