Products can no longer have more than 250 tags, whether they're created by an app using the API or created manually by merchants in the Shopify admin. This limit currently applies to stores on the Advanced Shopify plan and below.
This change has the following impacts on the REST Admin API:
If an UPDATE request adds tags to a product such that total number of tags exceeds 250, then the request fails with a 423 error code and the message "Tags cannot be added as the product already exceeds the new limit of 250 tags."
If a CREATE request creates a product with more than 250 tags, then request fails with a 423 error code and the message "Tags cannot be more than 250."
This change also effects the following GraphQL mutations: