Do you know where the Power BI Gateway log files are? I didn't! I'll show you a tool I use to help figure something like this out. And also tell you where they are!
Process Monitor
https://learn.microsoft.com/sysinternals/downloads/procmon
Rui Romano's Gateway Monitor Report
https://github.com/RuiRomano/pbigtwmonitor
The Power BI Gateway logs are located in the following folder: %ProgramData%\Microsoft\Power BI\Logs. This folder contains the core Power BI Gateway logs, as well as other logs related to the installation and configuration of the gateway. Logs are written in the form of text files, and can be opened and read in any text editor. They can provide valuable information during troubleshooting or debugging.
More results from community.powerbi.com
YouTube · Microsoft Power BI · 1 month ago
YouTube · RADACAD · Dec 5, 2022
Dec 5, 2022 — Credentials entered for the data source in Power BI are encrypted and then stored in the cloud. Only the gateway can decrypt the credentials.