I performed a test, and I was able to save do configuration without setting the IPsec Identifier. Check this info:
![alemabrahao_0-1671483669845.png alemabrahao_0-1671483669845.png](https://community.meraki.com/t5/image/serverpage/image-id/27394i0531654BD4F8F9D1/image-size/medium?v=v2&px=400)
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
Please, if this post was useful, leave your kudos and mark it as solved.