In addition, the study recommendations included:

Push messages frequently: "The best campaign results were those that regularly pushed benefits and enrollment information to employees via internal email or texting. Key information, like enrollment deadlines and how to access the enrollment portal, was consistent across all versions of the message."
Personalize messages: "Customization of employee benefits has become part of improving the employee experience. Digital enrollment campaigns were particularly effective, as they could be adjusted and customized for a variety of audiences in multiple languages across a dispersed workforce."
Compelling visuals and more content: "Compelling visuals and more frequent distribution of content was another overarching theme. The increase in voluntary benefit offerings combined with the need to transition to digital solutions during the pandemic meant an expanded communications effort and an emphasis on self-guided education."
Active enrollment prevails: "Campaigns that specified it was an active-enrollment period saw an engagement rate almost 30% higher than those that were explicitly passive or where active/passive wasn't specified at all (92% compared to 63%)."

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Online open enrollment: What's working?