In your scenario, when the error throws out, please access AzureBlobs site to check if the issue is occurring on that side. Also please use Fiddler to monitor traffic between Power BI and AzureBlobs, check if you can find any useful information. and sahre the Fiddler log here. Also please check if the error occurs when using Excel to connect to the data source.
Community Support Team _ Frank If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.