When you try to sync a product with many variants on Shopify, you could face an error like "Platform communication error: base:Exceeded maximum number of variants allowed"
This is due to a limitation of Shopify about the number of variants a parent product can have.
Google is full of Shopify merchants who have the same error (look here) and Shopify is clear on his documentation.
A product cannot have more than 100 variants > Documentation Link
What you can do to solve this?
We are working to let you choose only the variants you need so you can lower their number and go ahead with the synchronization.