What version of Solace Spring Cloud are you using?
It looks like the latest is using Boot 3.3.5 so it may not have been officially tested vs. 3.4.1 yet. But since this is just a minor version upgrade by Spring it should still work. Were you able to debug it at all and see if there is a specific header causing the issue or anything like that? Interesting that it’s calling “removeHeader”…any idea why?