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Power Point Online not working

Hello , i have sharepoint server and Office Online Server, i did all the configurations, installed the certificate and linked office with sharepoint, when users login to sharepoint portal everything works well except opening powerpoint online as shown in the screen , any help ?
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Hello ThereSystem Administrator
BRONZE EXPERT
Distinguished Expert 2018

Commented:
Does it happen just to the one file or all files?

Author

Commented:
No, it's happening for all PowerPoint files, i can upload pptx files normally but i cant view them with the mentioned error , Moreover i have some Events errors om my Server "attached"  

Kindly it's really urgent and i need to solve it ASAP.

Appreciate your help
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Hello ThereSystem Administrator
BRONZE EXPERT
Distinguished Expert 2018

Commented:
Does it happen just to one computer?
What browser do you use? Can you try other browsers?

Please check out this 4 step troubleshoot article.
https://docs.microsoft.com/en-sg/sharepoint/troubleshoot/lists-and-libraries/error-when-view-or-edit-in-browser

Author

Commented:
I guess the issue is because i installed OOS and ADDS on the same server , i read the same article somewhere else and the solution was to add Powerpoint view and word view on the SharePoint , Any advise please ?

Thanks

Author

Commented:
I reinstalled the SharePoint 2019 on the server , now I'm having a different issue, all office apps are not opening in Web View.

Any assistance ?
Commented:
Installing OOS on additional server