Ring Video Doorbell 2 not working with TP-Link Deco M9 plus

Hi,I have problems connecting my Ring Video Doorbell 2 to the WiFi network of my TP-Link Deco M9 plus. I have read several seemingly related posts. These are marked as solved while the given solution doesn't work for my configuration.My configuration:Ring Video Doorbell 2 with updated firmwareTP-Link Deco M9 plus with updated firmwareI have tried connecting with and without fast roaming activated. I have tried connecting to the WiFi as well as to a WiFi Guest network 2.4 only. The results are unpredictable in the sense that no working connection is made but that the Ring shows either the top two lights or the right two lights blinking white.Any suggestions?Kind regards,Lex