Why was I asked to reconfirm my Conditional Offer to Buy?

In the event of material changes to the prospectus, Interactive Brokers (IBKR) may need to reconfirm your Conditional Offer to Buy (COB). If a reconfirmation is needed, a message will be sent to impacted accounts. Failure to reconfirm your COB will result in the COB being canceled.

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How will I know when an IPO is available to accept Conditional Offers to Buy?
What happens if the IPO is cancelled?
How can I reconfirm a Conditional Offer to Buy?
Can a Conditional Offer to Buy be canceled or modified while the US IPO is open to accept COBs?