Staff at the Massachusetts Health Connector, the state’s health insurance marketplace, knew they would need to provide “belt-and-suspenders-levels of support” to the public this open enrollment season, Executive Director Audrey Morse Gasteier said.

As hundreds of thousands of Bay State residents explore their health insurance options on the marketplace over the next two-plus months, they’re doing it amid a flood of federal changes — from expiring subsidies to Trump administration-planned coverage losses.

The moment is so uncertain that a single vote from Congress could shift the majority of premiums from their current advertised prices.

“We were hoping to not be in this place where we were opening the doors on Nov. 1 for open enrollment with that uncertainty still looming over these m

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