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Getting a second passport can be a bit of a challenge, and the reason for requesting one must fall under one of two categories. The first is primarily for political reasons — some countries will deny you entry if you have a stamp from another country in your passport. For example, there are reports that numerous Middle Eastern countries have denied travelers entry if they have an Israeli stamp in their passport. Additionally, a second passport could be obtained if a passport is needed immediately but is unavailable due to delays processing a foreign visa application.
If you’re planning on getting a second passport with the new four-year validity, TPG recommends using a third-party service like Allied Passport & Visa, especially because all of the steps can be complicated. When TPG needs to renew his passport, or if he needs a visa, he goes to Allied Passport & Visa for quick and efficient service. Mention The Points Guy on your order form to get a $5 discount just for TPG readers.
Source: thepointsguy.com