I have the DECO P9's and due to a change in email accounts (long story - but do not set a child up with your email address for various games). Anyway,  I now have a new email address (the one currently used on the Deco App is to be closed). 

I tried chaning on the App - no luck there.

I looked in my history to see which TP websites I have accessed.

I tried changing the email address at www.tplinkcloud.com - no luck there. I cannot even change my email address on this website.

I tried https://accounts2.tplinkcloud.com - dead URL. 

I tried https://www.tp-link.com/uk/ - no luck there. 

I cannot change my email address anywhere - not even on this forum. 

Any advice on what my options are here.