I am using a dual account in ABC Pro with my business partner (this only works under a single Associate ID). Is this supported in the ASEA Connect Mobile app?

YES. Temporarily, to access both of your accounts, use the primary ASEA Virtual Office login for the person or account with the Associate ID number. The secondary account can be accessed by using the prior ABC username and password for the second account. Coming soon, you will both use the same login (the ASEA VO login) and will be given a choice of which version of the account to want to work with.