Starting from March 28th 2021, Supermetrics for Data Studio & Google Sheets has a restriction of 20 accounts per data source in Supermetrics website for most data sources that aren't marked as "premium".
Note: This account limitation is not applicable to the following data sources:
Facebook Public Data
Google Big Query
Instagram Public Data
Pinterest Public Data
Reddit Public Data
Tumblr Public Data
Twitter Public Data
VKontakte Public Data
Vimeo Public Data
For more than 20 accounts per data source, you must contact sales for a custom number of accounts.
For premium connectors, you must contact sales for a custom number of accounts.
The definition of "account" varies by data source.
Below is a list of data sources with account definitions and account limitations: