Forum Discussion
Open Office 365 Group site in SharePoint Designer 2013
First of all, please make sure you are aware of the latest guidance in customizing and branding modern team sites. Custom Master Pages in modern Team Sites are not supported and you should consider alternative approaches. The latest guidance is described in the article below.
https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/modern-experience-customizations-customize-sites
Apart from this, maybe the information in below blog helps to get rid of the error:
http://sharepointdesigner2013-forbidden.blogspot.nl/
First of all, please make sure you are aware of the latest guidance in customizing and branding modern team sites. Custom Master Pages in modern Team Sites are not supported and you should consider alternative approaches. The latest guidance is described in the article below.
https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/modern-experience-customizations-customize-sites
Apart from this, maybe the information in below blog helps to get rid of the error:
http://sharepointdesigner2013-forbidden.blogspot.nl/
