If you both get your SSDI direct deposited into your bank account, you should have no problem getting a direct deposit of your stimulus payment. If you don't have it direct deposited, you can try to enter your direct deposit information on the IRS stimulus payment portal: Get My Payment | Internal Revenue Service
See these Q&As: https://www.irs.gov/coronavirus/get-my-payment-frequently-asked-questions
If SSDI was your only income, you were not required to file a tax return and didn't need to to get the stimulus payment.