If you are on Social Security disability you should have received your stimulus check automatically--the IRS uses the same account you use when you receive your monthly SS benefits. Did someone claim you as a dependent--if so, that would prevent you from receiving a stimulus check. We have seen a number of SS and SSI recipients who were claimed as dependents by various family members without their knowledge.
https://home.treasury.gov/news/press-releases/sm967
You can call the IRS hotline at 1-800-919-9835 to get updates on your stimulus payment.
https://www.irs.gov/coronavirus/economic-impact-payment-information-center#nonfilertool
https://www.irs.gov/coronavirus/get-my-payment-frequently-asked-questions
https://ttlc.intuit.com/community/tax-topics/help/how-will-the-stimulus-package-impact-me/00/1393859
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**