object grpc is not a member of package play; PlayRouter can not be found

[bmo-at]

Hi, I am relatively new to Scala and Akka in general, so I'm hoping this won't be a big issue and I am missing something simple.
I am trying to add grpc endpoints to an existing API. After upgrading to Play 2.8.8 I run into the following issue:
On compiling, after the Server Code is generated, sbt tells me that it encountered 3 errors:

[error] /home/jan-robin.aumann/dev/caplon-rest/voip/target/scala-2.12/akka-grpc/main/com/consistec/voip/grafana/grpc/AbstractRouter.scala:11:13: object grpc is not a member of package play
[error] import play.grpc.internal.PlayRouter
[error]             ^
[error] /home/jan-robin.aumann/dev/caplon-rest/voip/target/scala-2.12/akka-grpc/main/com/consistec/voip/grafana/grpc/AbstractRouter.scala:18:13: not found: type PlayRouter
[error]     extends PlayRouter(GrafanaQueryAPI.name)
[error]             ^
[error] /home/jan-robin.aumann/dev/caplon-rest/voip/target/scala-2.12/akka-grpc/main/com/consistec/voip/grafana/grpc/AbstractRouter.scala:18:40: no arguments allowed for nullary constructor Object: ()Object
[error]     extends PlayRouter(GrafanaQueryAPI.name)
[error]                                        ^
[warn] two warnings found
[error] three errors found
[error] (Compile / compileIncremental) Compilation failed
[error] Total time: 118 s (01:58), completed Oct 18, 2021, 10:15:47 AM

Looking for solutions I found #215 #40 and #228 and at first I thought they might be related, but if they are I shouldn't be running into my issue...

General info:
sbt version: 1.5.5
scala version: 2.12.7
Play version: 2.8.8
Akka-grpc version: 1.0.3 (upgrade to 2.1.0 asap, but currently impossible due to dependency on scalapb 0.10.10 with custom changes)

[bmo-at]

One should include the proper dependency on play-grpc-runtime at the proper place in the build.sbt file like so:
libraryDependencies += "com.lightbend.play" %% "play-grpc-runtime" % "0.9.1"