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の際には

when; in the event of

→ の
phrase Rare #45,468
when; in the event of A formal expression used for occasions or situations, often in instructions or polite requests.
JA: お困りの際には、お電話ください。
EN: If you run into difficulty, please call us.

お帰りの際には傘をお持ちになるのを忘れないでください。

Please don't forget to take your umbrella when you leave.

お困りの際には、お電話ください。

If you need any assistance, please call us.