Invalid Client. Client Authentication failed.

Hi Rama, 

Can you clear your Cookies and local cache to see if that resolves the issue (or try in a different browser)? It could be that you have some data stored locally which conflicts. 

Let me know if that solved it. 

Best, 
Dennis

Hi Dennis,

Clearing browser history and deleting cache has solved the issue. Thank you.

Perfect, great to hear  

This works but the issue comes back. What can we do to solve it permanently?

In particular, it happens when attempting to run old-fashioned (6.x) entry points (custom page with custom result) in 7.8.2.0 Pro

Hi Francesca,

I just wanted to follow up on this post to see if you'd made any further determinations on this issue from your end, or if you had a set of steps that allow the issue to be reproduced on demand so that a defect could potentially be filed.

Thanks,
Stephen