So here is my issue,  I have a 5G Huawei Router, that's getting internet from a 5G sim card.  The router is then connected to a POE switch which then powers an OMADA Hardware Controller and 3 x EAPs (2 x 225 & 1 x 245).  So I have it all set up and working.  That's what I thought at first.  YouTube, BBC, other news websites work.  But my work VPN doesn't connect and neither does my IPTV. 

When I connect directly to the Huawei 5G router, both works absolutely fine which tells me the problem is in between which is the OMADA controller and the 3 x EAPs.  To further confirm this, I changed the router to a Fibre router from SKY, an ethernet cable from the Sky router into the POE Switch, which then connects to the OMADA controller and the 3 x EAPs.  And same issue happens.  When connected to the Wireless network of the OMAMA Controller/EAPs, those 2 things don't work, but when connected directly to the Sky Router, everything works as it should.

Other stuff might not be working which I'm not aware until I access it.

Is there a way to full unrestrict the network?  Does the issue lies with DNS?  DHCP? Bridge Mode?  I'm completely lost.  I have invested so much money in equipments, running cables behind walls, above ceiling, under the floor to wire my whole house with POE ethernet and now I can't the 2 most importants things to work.

Please help.