Does my spouse forgetting to sign up for Dependent Care FSA count as a loss of coverage qualifying event such that I could make a change to my company's enrollment?

My spouse has had the dependent care FSA for several years, but for some reason this year she forgot and we just found out after the open enrollment for both of our (different) employers have ended.  From an IRS standpoint, I'm wondering if this count as a life event (losing Dependent Care FSA) such that I could modify my open enrollment without issues.  It seems possible from my employers website, but wondering if this counts according to IRS rules.  Thanks for reading and any tips!