JWT Acceptance to authenticate user

I have a SaaS app where each client can customize its domain. For instance, the base domain is app.myname.com, but a client has the domain app.customer_name.pt, When accessing the ticket portal through the base domain, everything works flawlessly. However, when a client with a customized domain tries to access the ticket portal, the cookies aren't transferred, due to the different domains. Is there any way the ticket portal link can accept the JWT that authenticates the user, allowing the ticket portal to create the necessary cookies?