IP whitelist not working - Phishing Simulation setup

Just an additional hint to what vinaybabupamu written before,
Please check if you added in the Advanced Delivery -> Phishing Simulation the domain of sender (envelope sender, P1) or DKIM domain of the message. Because for Phishing sim. match it must be both to match IP and domain. https://learn.microsoft.com/en-us/defender-office-365/advanced-delivery-policy-configure -> "There must be a match on at least one Domain and one Sending IP"
P.S.
I would remove Exchange transport rule and IP white list in anti-spam policy - connection filter policy, they do almost same (bypass some scans) and not needed here in case of use Phishing Simulation.