Do you have the mobile app available for client to login? Just like the one you have for web version below
Best answer by Gabriel Michaud
There are currently no mobile screen definitions configured in the site map for the Company Portal. Once Acumatica adds this to the application, a client would be able to login by using the same mobile app.
There’s a suggestion in the Ideas section for this enhancement -- make sure to cast your vote!
P.S. if this is an immediate requirement, please note that the Acumatica framework allows creation and customization of mobile pages, so this could be built by your partner or an external developer.