For Laravel bugs you should report them in: https://github.com/laravel/framework/issues/
I see this issue: https://github.com/laravel/framework/issues/44544 and it looks like the mail:message error is fixed in 9.34.1
About the build function, is that something that isn't in the generated class?
in the documentation they don't mention the build class. Instead they use the content() and envelop() classes
Follow this example, hope it can help you. How To Send Email In Laravel 9 Using Markdown Mailables?
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