Unable to access 50+ whm guild qiests due to product key

upon teaching level 50 white mage, the game flashed a message stating “in order to proceed with whm guild quests, you must first register a product key” I have zero clue as to what this meant. I looked it up and can’t find a single thing other than an explanation of registering when first starting the game. I’m missing out on 3 abilities because I can’t go further.

Date & Time:
Frequency:
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Character name:
Retainer name:
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Class/Level: whm/ 54
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Housing:
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*Add more steps if necessary

Connection Specs
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■ PC Specs

To obtain the system information, open the FFXIV launcher and select Config → System Information → Display.

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Laptop Model Number:

Gamepad Manufacturer:
Gamepad Model Name:
Gamepad Part Number:

Browser Information
- Name and version of the browser currently in-use:
- Internet Explorer Version:

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■ PS4 Specs

Model Number of the PlayStation®4 You Are Using
- Model Number:

Model Number of the PlayStation®Vita You Are Using
- Model Number:

Information About the Peripherals You Are Using
-Type:
-Maker:
-Model Number:

you do know you have to buy the expansion to keep going right?

Once you hit level 50, unless you purchase and register a copy of Heavensward, you cannot progress any further. Same applies once you hit level 60: you will need to purchase and register a copy of Stormblood to get to 70 to access any further content, including new abilities and job quests.