In plugins that support MiniMessage, the color transition is written with a label. Check MiniMessage support separately for the relevant area of the settings file.
Step by step
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Verify that the message field you edited in the plugin document accepts MiniMessage. Some plugins use different formats in different areas.
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As a simple example, type
<gradient:#22c55e:#38bdf8>Sunucu adı</gradient>. If in YAML, use quotes according to the string format requested by the plugin. -
Use only text and color on your first try. Then add labels such as thickness if necessary and check that the opened labels close correctly.
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See the message in-game with your normal user account. If the tags appear clearly as text, the domain may be using another parser.
Keep in mind
Writing this tag directly in the vanilla server.properties line does not add MiniMessage support.