I'm facing an issue in Power Pages where the "Edit site header" dialog box is not appearing when I click on the Edit site header button. I am trying to Change the Company Name and Logo
You should have a System Administrator or Global Admin role in the environment. Ensure you are assigned to the Web Role in the Power Pages setup that has permissions to edit the site.
try to login and change using incognito/private browsing window.
Unable to Open 'Edit Site Header' Dialog Box in Power Pages
I seem to be having the same issue
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