authentication rejected

Hi

I see this has been asked before, but can see a solution that works. I use either ipad or laptop toconnect unit Teamviewer 10 (I prefer this version) It used to be ok and if I have the machines at working using the same internet it is fine so I guess it is my network at home. ( not very compter savy)  Any ideas it used to work.  I am running Windows 10 on laptop and just the app on the ipad neither of which will work.  Checked obvious password correct pc etc.