This time we’re going bigger than ever. Fabric, Power BI, SQL, AI and more. We're covering it all. You won't want to miss it.
Learn moreGet Fabric Certified for FREE during AI Skills Fest. This week only. Secure your voucher now.
I am trying to create data flow conecting to excel-file (other local files too) and get problem:
Full tray:
---------- Massage ----------
Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.
---------- Stack ----------
Error: Failed to execute 'atob' on 'Window': The string to be decoded is not correctly encoded.
at https://europe.prod.powerquery.microsoft.com/MashupEditor/scripts/app.b09c51d9cac4a8220b5b.bundle.js...
at https://europe.prod.powerquery.microsoft.com/MashupEditor/scripts/app.b09c51d9cac4a8220b5b.bundle.js...
Are you trying this with .xls files ?
Yes, this error appears with other files too (csv, txt, json)
What is the locale on your computer?
Russian (Russia)
Can you recode your source data into UTF-8 or UCS?
Check out the May 2026 Power BI update to learn about new features.
Sign up to receive a private message when registration opens and key events begin.
If you have recently started exploring Fabric, we'd love to hear how it's going. Your feedback can help with product improvements.
| User | Count |
|---|---|
| 14 | |
| 10 | |
| 10 | |
| 7 | |
| 7 |
| User | Count |
|---|---|
| 37 | |
| 32 | |
| 28 | |
| 22 | |
| 20 |