Request failed with status code 400

[tisall]

I recently subscribed to Semaphore Pro 10 and received the license key. However, when I attempted to apply the key through the UI, I encountered the following error:

Request failed with status code 400

Could someone assist me in resolving this issue?

[fiftin]

Hi @tisall

Thank you for reporting this. It's indeed a problem, as the error message is completely misleading.

[wtfawk]

Any update on this? I have this as well.
I cannot activate my license now.

This is the error i get from my container:

time="2025-11-26T10:39:19+01:00" level=error msg="crypto/rsa: verification error"
goroutine 48 [running]:
runtime/debug.Stack()
        /usr/local/go/src/runtime/debug/stack.go:26 +0x5e
runtime/debug.PrintStack()
        /usr/local/go/src/runtime/debug/stack.go:18 +0x13
github.com/semaphoreui/semaphore/api/helpers.WriteError({0x298fa10, 0xc0004a8000}, {0x298a7c0, 0xc00053eae0})
        /go/src/semaphore/api/helpers/write_response.go:52 +0x192
github.com/semaphoreui/semaphore/pro/api.(*subscriptionControllerImpl).Activate(0xc000123c60, {0x298fa10, 0xc0004a8000}, 0xc000481540)
        /go/src/semaphore/pro_impl/api/subscriptions.go:56 +0x15a
net/http.HandlerFunc.ServeHTTP(0x298fa10?, {0x298fa10?, 0xc0004a8000?}, 0xec4880?)
        /usr/local/go/src/net/http/server.go:2294 +0x29
github.com/semaphoreui/semaphore/api.authentication.func1({0x298fa10, 0xc0004a8000}, 0x1?)
        /go/src/semaphore/api/auth.go:278 +0x50
net/http.HandlerFunc.ServeHTTP(0xfa3560?, {0x298fa10?, 0xc0004a8000?}, 0xc?)
        /usr/local/go/src/net/http/server.go:2294 +0x29
github.com/semaphoreui/semaphore/api.JSONMiddleware.func1({0x298fa10, 0xc0004a8000}, 0xc000481400)
        /go/src/semaphore/api/router.go:57 +0xf6
net/http.HandlerFunc.ServeHTTP(0xeb5f00?, {0x298fa10?, 0xc0004a8000?}, 0x7aa18c?)
        /usr/local/go/src/net/http/server.go:2294 +0x29
github.com/semaphoreui/semaphore/api.StoreMiddleware.func1.1()
        /go/src/semaphore/api/router.go:48 +0x28
github.com/semaphoreui/semaphore/db.StoreSession({0x29a4760, 0xc00000ecd8}, {0xc00051c210, 0xc}, 0xc0006597c8)
        /go/src/semaphore/db/Store.go:696 +0x5f
github.com/semaphoreui/semaphore/api.StoreMiddleware.func1({0x298fa10, 0xc0004a8000}, 0xc000481400)
        /go/src/semaphore/api/router.go:47 +0x114
net/http.HandlerFunc.ServeHTTP(0xc0004812c0?, {0x298fa10?, 0xc0004a8000?}, 0xf2a8a0?)
        /usr/local/go/src/net/http/server.go:2294 +0x29
github.com/semaphoreui/semaphore/cli/cmd.runService.func1.1({0x298fa10, 0xc0004a8000}, 0xc00053e420?)
        /go/src/semaphore/cli/cmd/root.go:152 +0x11b
net/http.HandlerFunc.ServeHTTP(0xc000095801?, {0x298fa10?, 0xc0004a8000?}, 0x4198e5?)
        /usr/local/go/src/net/http/server.go:2294 +0x29
github.com/semaphoreui/semaphore/api.Route.CORSMethodMiddleware.func2.1({0x298fa10, 0xc0004a8000}, 0xc000480dc0)
        /go/src/semaphore/vendor/github.com/gorilla/mux/middleware.go:51 +0x87
net/http.HandlerFunc.ServeHTTP(0xc000480a00?, {0x298fa10?, 0xc0004a8000?}, 0xc0000959b8?)
        /usr/local/go/src/net/http/server.go:2294 +0x29
github.com/gorilla/mux.(*Router).ServeHTTP(0xc0000ba840, {0x298fa10, 0xc0004a8000}, 0xc000480280)
        /go/src/semaphore/vendor/github.com/gorilla/mux/mux.go:212 +0x1e2
github.com/semaphoreui/semaphore/cli/cmd.runService.ProxyHeaders.func3({0x298fa10, 0xc0004a8000}, 0xc000480280)
        /go/src/semaphore/vendor/github.com/gorilla/handlers/proxy_headers.go:59 +0x143
net/http.HandlerFunc.ServeHTTP(0xc0004fe025?, {0x298fa10?, 0xc0004a8000?}, 0x1?)
        /usr/local/go/src/net/http/server.go:2294 +0x29
github.com/semaphoreui/semaphore/cli/cmd.runService.cropTrailingSlashMiddleware.func5({0x298fa10, 0xc0004a8000}, 0xc000480280)
        /go/src/semaphore/cli/cmd/server.go:27 +0xbd
net/http.HandlerFunc.ServeHTTP(0x4198e5?, {0x298fa10?, 0xc0004a8000?}, 0xc0004a8001?)
        /usr/local/go/src/net/http/server.go:2294 +0x29
net/http.serverHandler.ServeHTTP({0x298c2b0?}, {0x298fa10?, 0xc0004a8000?}, 0x6?)
        /usr/local/go/src/net/http/server.go:3301 +0x8e
net/http.(*conn).serve(0xc000376090, {0x2991c18, 0xc000467140})
        /usr/local/go/src/net/http/server.go:2102 +0x625
created by net/http.(*Server).Serve in goroutine 1
        /usr/local/go/src/net/http/server.go:3454 +0x485