Authentication Error while accessing Looker

We have been facing issues while accessing Looker Dashboard when the dashboard is embedding into the iframe. It works for some of team members but for others, it is not working fine. 

Initially it was working on my system and we figured out that we have to turn on third party cookies and have to login into Looker in the browser in new tab to access it. It was working fine for few days before authentication error have started creating issue.

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