Trailheadの設定や操作など

We couldn't create a Trailhead Playground.  Wait a minute and try again.

Appインストールの仕方のコピー用

Sandboxでメールが送信できない。

Flow - Send email in Sandbox (professional editon)
通常、電子メールがOutlookアカウントに送信される場所。Outlookのセキュリティ設定により、電子メールのトークンが破損し、この動作が発生する場合があると思います。

Hands-on Challenge

Your Trailhead Playground comes with (2) full Salesforce licenses. If you've already used up both licenses and you try to create the new System Administrator user, it will look like this: 

https://trailhead.salesforce.com/en/help?article=Data-Security-Trailhead-Challenge-Help&topic=Hands_on_Challenge&topicName=Hands-on%20Challenge&groupName=Trailhead_Support

Specialist Superbadge

Apex Specialist Superbadge: Trailhead Challenge Help
Lightning Web Components Specialist Superbadge: Trailhead Challenge Help

ユーザ名の重複

The check oon duplicate usernames is done in EVERY single Salesforce org, even the ones that don't belong to you.
Add some numbers or whichever. the colour is not checked, so you can make your own (blueyeallowandbrown for example) :)

Customize an Org to Support a New Business Unit > Manage User Access