Hi @Muhammad Zeeshan ,
the URL you should use depends on the AVD deployment you did.
If you have deployed the AVD Classic version the URL is: https://client.wvd.microsoft.com/webclient/index.html
If you have deployed the AVD ARM based version the URL is: https://rdweb.wvd.microsoft.com/arm/webclient/index.html
The URLs are working only with the related version of the AVD deployment. The URLs can't be mixed.
Your AVD deployment is based on which version? The Classic or the ARM based version?
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Regards
Andreas Baumgarten