@alex_zheng
Thanks for your input. I ran some tests today and was able to get it working. The IP address at the AP was indeed one of the culprits.
The other one, is embarassing for me. I did not realize, there are both “Repeater” mode and a “Extender” mode available. I believe what I needed is the “Extender” mode and set it accordingly.
Is the explanation from the following forum post still hold true?