Try Microsoft Edge
A fast and secure browser that's designed for Windows 10
I've been able to make acct changes before but now it tells me this, despite being an admin."Try this action again. If the problem continues, check the Microsoft Dynamics 365 Community for solutions or contact your organization's Microsoft Dynamics 365 Administrator. Finally, you can contact Microsoft Support. If you contact support, please provide the technical details."
Can you provide more information? What are you trying to do? There usually is an option to download a log file when this type of error is displayed.