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Hi AshifKattuparuthi,
To investigate this issue, I’d like to confirm whether you have turned on scripting capabilities. If not, the Add and Customize Pages permission will be denied. Please follow the steps below to turn it on to see the outcome.
- Sign in to Office 365 with your work or school account.
- Go to the SharePoint admin center.
- Select Settings.
- Under Custom Script choose:
Allow users to run custom script on personal sites.
Allow users to run custom script on self-service created sites.
Note: It may take up to 24 hours for the change to take effect.
For more information about the scripting capabilities, you can refer to the article below:
Thanks,
Ran