If you are married and file your taxes separately from your spouse, you will not be eligible to receive a subsidy for your health plan. In this scenario, you would pay the full premium price for your plan. If married but separated, the spouse who files as head of household can be eligible for a subsidy.
If you are planning on filing separately from your spouse then you can still sign up through Stride. However, you will need to be sure to indicate that you are filing separately for your spouse in the application. Once you select that you will not be eligible for a subsidy and your premium price will increase from the quote that you saw earlier because you no longer have the subsidy.