Valid Ad Server URL Times Out in RAF Sample App

Using the sample app for RAF, I tried adding a valid ad server URL that always returns an ad. In the console, it says the ad server URL is timing out. The device I'm testing with has an internet connection, so I don't understand why this is happening.

Here's the dev console output:

------ Running dev 'Sample use of RAF in RSG' main ------
Player: taskStateChanged(), id = PlayerTask, state = run

[RAF] setDebugOutput(true)

[RAF] Roku_Ads Framework version 2.1722

[RAF] setDebugOutput(false)

[RAF.err] getStringFromUrl("https://securepubads.g.doubleclick.net/gampad/ads?env=vp&gdfp_req=1&output=xml_vast3&unviewed_position_start=1&sz=640x480&url=https%3A%2F%2Fwww.test.com&iu=/1018653/video_unit_roku&sdkv=h.3.441.0&vad_type=linear&rdid=e4a1455f-a67e-5289-b426-3e775e64e9d2&is_lat=0&idtype=rida"): Request timed out

[RAF.err] getAds(); response error: Request timed out

[RAF.err] no content id set when expanding ROKU_ADS_CONTENT_ID, defaulting to channel name. Consider using raf.setContentId()

[RAF.err] getStringFromUrl("https://ravm.tv/ads?rtid=quxS7ot2ntVc23tFoX2d&ai=dev&channel_id=dev&coppa=0&rdid=e4a1455f-a67e-5289-b426-3e775e64e9d2&ottid=&is_lat=&is_roku_lat=0&genre=Drama&content=Sample%20use%20of%20RAF%20in%20RSG&length=6106&device=4660X&ua=Roku%2FDVP-10.5%20%2810.5.0.4208-46%29&sz=1920x1080&correlator=1641932408996&scor=&inv_type=rr&is_roku=1&is_raf=1&ssai_req=0&is_pod=0&tag_type=VAST&version=1&ip=&min_ad_duration=0&max_ad_duration=92000&idtype=&pod_min=&pod_max=&pod_ads=&pod=&ppos=&ad_vertical=&ad_roll=&ott_app_id=&platform=&studio_id=&content_type=&series_id=&season_id=&content_rating=&fb_url=&roku_cust_param=device_lang%3Den_US"): Request timed out

[RAF.err] getAds(); response error: Request timed out
PlayerTask: state = buffering
PlayerTask: state = playing
01-11 20:20:21.271 [beacon.signal] |VODStartInitiate ----------> TimeBase(6605 ms)
01-11 20:20:21.271 [beacon.signal] |VODStartComplete ----------> Duration(22337 ms)
Player: keyevent = back
Player: exitPlayer()
EntryScene: PlayerStateChanged(), state = done
PlayerTask: state = stopped
PlayerTask: exiting playContentWithAds()