It's nice to see you here in the Community, @CRDBSTR. Let me provide information about inviting an accountant to QuickBooks Solopreneur.
To start with, QuickBooks Solopreneur (QBSP) is designed for individuals with a one-person business who want to organize and grow their business, whether or not they use 1099. At present, it is not possible to add your accountant to your Solopreneur account.
However, if you want to provide your accountant with access to your account, you can utilize any of our QuickBooks Online (QBO) accounts tailored for small businesses. This will allow you to maintain your financial records online across multiple devices.