Thanks for reaching out. From the screenshot you provided, it looks like you’re trying to access a file in a different team. You’re logged into SalesForza but trying to access a file in Matea. In this case, all users need Edit access to use Dev Mode in the SalesForza team.
I hope this clarifies the situation.If the issue persists, since it needs account information, could you reach out directly to the support team with a copy of your file: https://help.figma.com/hc/en-us/requests/new? Our support team will look into it.