Vigor 2865ax connected through Sky SR203 router Ring Cam issue

Above configuration and everything working perfectly except my Ring Door cam!!
It fails during setup saying it cannot find the network even though it allows me to select it during the initial process.
It works fine if i share my mobile connection so i know its somehow router related.
Anyone come across this issue?

After much messing around finally resolved the issue by temp disabling the Firewall>Filter Setup>Set 1 Default Data Filter>Rule 1, connecting the ringcam, then reenabling the rule.
Not sure why it was causing the issue and needs further investigation but its a workaround at least.
 

Any particular reason for using the Sky router in series - you don't need to anymore...just curious.

only way to maintain the Sky house telephone that has to be connected to the Sky Router, apparently no way round it!