RE: Will Associate and disassociate entities using the Web API will work with offline mobile?
Hi Rocky,
Please see the following
"The client SDK can’t be used to create or update intersect entity records; offline disabled entity records; or activity party entities records. No upfront validation of data input occurs. All data-related validations are done during the sync to Dynamics 365."
Since associate and disassociate create records in the intersect entities, I do not think you will be able to use Associate and Disassociate offline. This might change in the future, but as of now, it does not look like its a possibility.
https://crmtipoftheday.com/1020/dynamics-365-mobile-offline-limitations/