What is the Azure Cloud security group and cloud office365 group members limit?

[Amit Gupta]

This Microsoft document suggests that a security group can have 50K members if synchronization is setup with Azure AD Connect. However, if I am creating a cloud security group (via Azure Portal) which does not sync back to on-premise then what would be the members limit for it?

Also, what would be the members limit for cloud Office365 group?

[#2]

As per the documentation, there is no limit 

• Any number of objects can be members of a single group in Azure Active Directory.

source: https://docs.microsoft.com/en-us/azure/active-directory/active-directory-service-limits-restrictions