CSIS, in partnership with its colleagues, assumed that as soon as work began with the House of Commons, the House authorities would inform the MPs. This didn't happen for various reasons.
I know that the conditions under which it happened were complex; it was during the COVID-19 pandemic. There were all kinds of restrictions on who would be present at the office, which complicated meetings. It was before the vaccine was available. Canadian Security Intelligence Service employees were in the office throughout the pandemic, which contributed to some of the confusion in the allocation of tasks.
Having said that, I believe we should all just ask ourselves how we could handle things better in the future.