If you are filing separately you have a max of $4,000, but can carry over your contributions for up to five years. If you filed separate on a combined return, you will both get the $4,000.
According to the Instructions published by the DC Dept of Revenue:
You may deduct up to $4,000 annually for contributions you made to all qualified college savings accounts of which you are the owner. If you are married and file a joint or combined separate return, each spouse/registered domestic partner may deduct up to $4,000 for contributions made to all accounts for which that spouse/registered domestic partner is the sole owner. Contributions made to one or more accounts in excess of the allowable $4,000 ($8,000 for eligible joint filers) annual deduction may be carried forward as a deduction (subject to the annual limitation) for up to five years.
https://otr.cfo.dc.gov/sites/default/files/dc/sites/otr/publication/attachments/2019%20D-40_Booklet....
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