custom package build fails (micro-ROS)

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This is NOT a duplicate question, please don't just close this topic. Provide some insight to where "the supposedly" duplicate question can be found. I have been looking through here to see if there are any similar questions, that might help solving the issues I'm facing. However, I wasn't able to find anything.

I'm building a custom package with custom message, based on oled_display_node

VS Code + PlatformIO building microros

before attempting I clean the environment, as so:

1. pio run --target clean_microros
2. platformIO: Clean (little trash-bin icon)
3. delete the .pio directory

Then I build as per below:

1. pio init
2. pio lib install
3. pio run

I have created the

DisplayOutput.msg

with the following content:

# Request to place text on the display.
# The display row and column as well as string specifics are required
# A comment field is used to assist user debug

# actionType values
uint8  DISPLAY_ALL=1              # Message to fill entire display
uint8  DISPLAY_SUBSTRING=2        # Message for a set of characters on one line
uint8  DISPLAY_STARTUP_STRING= 3  # Reserved for future use for non-volatile startup string
uint8  DISPLAY_SET_BRIGHTNESS= 4  # Sets display brightness. attributes is the brightness

int32  actionType                 # The type of action to be taken. See MSG_DISPLAY for values
int32  row                        # The display row of characters for this message
                                  # row can be from 0 to 7 where 0 is top line
int32  column                     # The starting horizontal pixel column
                                  # The column can be 0 - 118 where 0 is start at the left
int32  numChars                   # Number of characters to go to the display
int32  attributes                 # Used for brightness level 
string text                       # The text for this display update.  Up to 15 characters
string comment                    # Optional comment the user can use to document purpose

However, when I un-comment this line

"msg/DisplayOutput.msg"

inside my CMakeList.txt the compiler throws an error. (trace below)

CMakeList.txt cmake_minimum_required(VERSION 3.8) project(teensy_interfaces)

if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  add_compile_options(-Wall -Wextra -Wpedantic)
endif()

# find dependencies
find_package(ament_cmake REQUIRED)

# -----------------------------
find_package(geometry_msgs REQUIRED)
find_package(std_msgs REQUIRED)
find_package(rosidl_default_generators REQUIRED)

rosidl_generate_interfaces(${PROJECT_NAME}
  "msg/Num.msg"
  "msg/Sphere.msg"
  "msg/Bool.msg"
  "msg/Int64.msg"
  "msg/String.msg"
  "msg/Int32.msg"
  "msg/UInt8.msg"
  "msg/DisplayOutput.msg"
  "srv/AddThreeInts.srv"
  "srv/NeoPixelControl.srv"
  "srv/OledDisplay.srv"
  DEPENDENCIES geometry_msgs std_msgs # Add packages that above messages depend on, in this case geometry_msgs for Sphere.msg
)
# -----------------------------

if(BUILD_TESTING)
  find_package(ament_lint_auto REQUIRED)
  # the following line skips the linter which checks for copyrights
  # comment the line when a copyright and license is added to all source files
  set(ament_cmake_copyright_FOUND TRUE)
  # the following line skips cpplint (only works in a git repo)
  # comment the line when this package is in a git repo and when
  # a copyright and license is added to all source files
  set(ament_cmake_cpplint_FOUND TRUE)
  ament_lint_auto_find_test_dependencies()
endif()

ament_package()

package.xml

<?xml version="1.0"?>
<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
<package format="3">
  <name>teensy_interfaces</name>
  <version>0.0.1< ...