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Form submission get blocked because the frame is sandboxed & the 'allow-forms' permission is not set

Hello All, 
I develope web application using python & Fask having form submission in it which connects to sql server database. Then used that application URL in iframe as source in column of power bi table shared image below and publish that report on service.


I used HTML Viewer visual to open that web application and it opens that web application but when I try to submit form, I get error  - "Blocked form submission to '/add_destplat' because the form's frame is sandboxed and the 'allow-forms' permission is not set. "

But as you can see in first image I already provided sandboxed attributes "allow-script allow-forms". How I can submit the form in IFrame?Any help will be great.
Thanks in Advance!!



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