You have purchased the album.
Click Music.
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Then check again -> Music Libary -> Recently added.
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See also the following Apple articles:
View your purchase history for the App Store, iTunes Store, and other Apple media services
View your purchase history for the App Store, iTunes Store, and other Apple media services - Apple Support
Redownload music in the iTunes Store app on your iPhone, iPad, or iPod touch
Redownload music - Apple Support
If there's an issue when you re-download apps, films or other content from Apple
If there's an issue when you re-download apps, films or other content from Apple – Apple Support (UK)
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If you can't see the item that you want to redownload
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If there is a problem when you re-download
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If you have received an invoice from Apple, tap on Report a problem on the invoice.
How apps, content, and subscriptions from Apple are billed
How apps, content, and subscriptions from Apple are billed - Apple Support
If you still need help, get more help and assistant from Apple directly, see Contact Apple for support and service -> Contact Apple for support and service – Apple Support (UK)