My application is deployed on Azure.
Whenever I try to upload multiple documents in the application using CSOM in SharePoint Online, I get 429 error.
My application is deployed on Azure.
Whenever I try to upload multiple documents in the application using CSOM in SharePoint Online, I get 429 error.
The 429 ("Too many requests") error could mean that you get throttled, you could go through the article Avoid getting throttled or blocked in SharePoint Online. It may give you the basic idea behind this error and you may find out why this error is generated.
Here are best practices to handle throttling in the article:

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Hi @PrateekSrivastava-2439 ,
How are things going? Is there any update on your issue?
I am willing to hear from you.
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