Bazel googleapi gRPC cc_grpc_library output was not created - google-api

Question

I am running into Bazel build issues when I try to build googleapis texttospeech_proto and speech_proto with gRPC service. In the root directory of my project, I receive the following error:
ERROR: <>/BUILD:42:1: output 'external/com_google_googleapis/google/cloud/texttospeech/v1/cloud_tts.grpc.pb.h' was not created
ERROR: <>/BUILD:42:1: output 'external/com_google_googleapis/google/cloud/texttospeech/v1/cloud_tts.grpc.pb.cc' was not created
ERROR: <>/BUILD:42:1: not all outputs were created or valid
My BUILD/WORKSPACE files are below:
BUILD
load("#com_github_grpc_grpc//bazel:cc_grpc_library.bzl", "cc_grpc_library")
cc_proto_library(
name = "speech_cc_proto",
deps = [
"#com_google_googleapis//google/cloud/speech/v1p1beta1:speech_proto",
],
visibility = ["//visibility:public"],
)
cc_grpc_library(
name = "cloud_speech_grpc",
srcs = [
"#com_google_googleapis//google/cloud/speech/v1p1beta1:speech_proto",
],
deps = [
":speech_cc_proto",
],
grpc_only = 1,
use_external = 1,
visibility = ["//visibility:public"],
)
cc_proto_library(
name = "texttospeech_cc_proto",
deps = [
"#com_google_googleapis//google/cloud/texttospeech/v1:texttospeech_proto",
],
visibility = ["//visibility:public"],
)
cc_grpc_library(
name = "cloud_texttospeech_grpc",
srcs = [
"#com_google_googleapis//google/cloud/texttospeech/v1:texttospeech_proto",
],
deps = [
":texttospeech_cc_proto",
],
grpc_only = 1,
use_external = 1,
visibility = ["//visibility:public"],
)
WORKSPACE
git_repository(
name = "com_github_grpc_grpc",
remote = "https://github.com/grpc/grpc.git",
tag = "v1.27.0-pre1",
)
load("#com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")
grpc_deps()
load("#com_github_grpc_grpc//bazel:grpc_extra_deps.bzl", "grpc_extra_deps")
grpc_extra_deps()
load("#io_bazel_rules_python//python:pip.bzl", "pip_import", "pip_repositories")
pip_import(
name = "grpc_python_dependencies",
requirements = "#com_github_grpc_grpc//:requirements.bazel.txt",
)
load("#grpc_python_dependencies//:requirements.bzl", "pip_install")
pip_repositories()
pip_install()
git_repository(
name = "com_google_googleapis",
remote = "https://github.com/googleapis/googleapis.git",
commit = "3c39a1d6e23c1ef63c7fba4019c25e76c40dfe19",
)
load("#com_google_googleapis//:repository_rules.bzl", "switched_rules_by_language")
switched_rules_by_language(
name = "com_google_googleapis_imports",
cc = True,
grpc = True,
)
If I move my BUILD file out of the root workspace (into a child workspace/folder), I receive a different error saying the cloud_speech.proto / cloud_tts.proto files are not within the child workspace.