I have the same issue, and QB support has been useless in helping resolve the issue. The agent I just talked to said I was not eligible, even though they don't even know what the eligibility requirements are.  Very frustrating! I have actively used the account for 6 months waiting on this feature. When I called about the issue 3 months ago, the customer service agent had told me that the account would need to be active and in good standing for 3-6 months to be eligible. Here we are 6 months later and still no mobile check deposit feature. This is truly ridiculous.