@Kroeb 

Good day.

Can I have a picture of the error on the APP?

And just now I checked with my email account and I could log in to the https://www.tplinkcloud.com/admin.php, but there are no cameras bound to my account, sorry;

Did this error pop up on both the local networks and 4G networks?

Did you use an iPhone or Android phone? If it is an iPhone, is it on IOS14?

If possible, please try to change the DNS server on the home router to be 8.8.8.8 to have a look?

By the way, May I know where are you located and who is your internet service provider?

Thanks a lot.

Good morning all,

I continued to diagnose this issue last night and to no avail. I reset all cameras, I reconnected them to the house wifi. Reinstalled the phone app on iOS and Android phones and no avail. I could not log in on the App on either phone nor could I bring up the URL www.tplinkcloud.com to log in that way. I was able to successfully login though on the TPlink Forums page so the login was working fine. I was able to connect to the cameras in the house via IP fine though

I even went to the extreme of taking a camera to a friend's house and set up on his wifi and the same issues. Connection via IP to the camera was fine, but no go with the app on a phone nor access to the URL.

This morning though everything is working fine again. I was finally able to log in on the app on the phone and see all the cameras and access the live feed. I was also able to access the URL and login successfully and see all the cameras on TP-Link Cloud.

So I am thinking there was a problem with the TPLink cloud services and that this has now been corrected :)

So I would like to thank people for their help and assistance, especially Hedrison who I chatted with Online from TPLink and via email. I have advised Hedrison to close this support case as all is now working as it should :)

Cheers - Paul