Thank you for everyone's help!
When I click program in Arduino IDE, I see the verbose output in Teesnyduino:
14:42:51.101 (loader): file changed
14:42:51.113 (loader): File "Teensy_PWM_white_LED_RTC_V1_FUNCTIONAL.ino.hex". 41828 bytes, 8% used
14:42:51.239 (post_compile 29): Begin, version=1.45
14:42:51.240 (loader): remote connection 13 opened
14:42:51.245 (post_compile 29): Sending command: comment: Teensyduino 1.45 - MACOSX (teensy_post_compile)
14:42:51.251 (loader): remote cmd from 13: "comment: Teensyduino 1.45 - MACOSX (teensy_post_compile)"
14:42:51.254 (loader): remote cmd from 13: "status"
14:42:51.257 (post_compile 29): Status: 1, 1, 0, 0, 0, 0, /var/folders/5m/_mwb08456bn5nr_w8c8gv2100000gn/T/arduino_build_230920/, Teensy_PWM_white_LED_RTC_V1_FUNCTIONAL.ino.hex
14:42:51.257 (post_compile 29): Disconnect
14:42:51.289 (post_compile 30): Begin, version=1.45
14:42:51.340 (loader): remote connection 14 opened
14:42:51.343 (post_compile 30): Sending command: comment: Teensyduino 1.45 - MACOSX (teensy_post_compile)
14:42:51.350 (loader): remote connection 13 closed
14:42:51.358 (loader): remote cmd from 14: "comment: Teensyduino 1.45 - MACOSX (teensy_post_compile)"
14:42:51.369 (loader): remote cmd from 14: "status"
14:42:51.372 (post_compile 30): Status: 1, 1, 0, 0, 0, 0, /var/folders/5m/_mwb08456bn5nr_w8c8gv2100000gn/T/arduino_build_230920/, Teensy_PWM_white_LED_RTC_V1_FUNCTIONAL.ino.hex
14:42:51.372 (post_compile 30): Disconnect
14:42:51.384 (post_compile 31): Running teensy_reboot: /Applications/Arduino.app/Contents/Java/hardware/teensy/../tools/teensy_reboot
14:42:51.452 (loader): remote connection 13 opened
14:42:51.458 (reboot 32): Begin, version=1.45
14:42:51.458 (reboot 32): location = /dev/cu.Bluetooth-Incoming-Port
14:42:51.458 (reboot 32): portprotocol = serial
14:42:51.458 (reboot 32): portlabel = /dev/cu.Bluetooth-Incoming-Port
14:42:51.458 (reboot 32): Serial device /dev/cu.Bluetooth-Incoming-Port will be tried first
14:42:51.458 (reboot 32): USB device add callback
14:42:51.509 (loader): remote connection 13 closed
14:42:51.519 (loader): remote connection 13 opened
14:42:51.521 (reboot 32): USB device remove callback
14:42:51.522 (reboot 32): Serial add callback
14:42:51.532 (reboot 32): Serial remove callback
14:42:51.535 (reboot 32): HID Manager started
14:42:51.536 (reboot 32): Disconnect
14:42:51.611 (loader): remote connection 13 closed
14:42:51.628 (loader): remote connection 14 closed
Also, here's a pic of the breadboard. everything has been disconnected except for a couple of pull up resistors to SCL0 and SDA0 lines in hopes that something was pulling down the circuitry. No such luck. This 3.3V line as well as the one mentioned in the previous post are both functional.