The Law Society of Kenya (LSK) president Faith Odhiambo has called on Foreign Affairs Principal Secretary Korir Sing'oei to intervene after PLP Martha Karua was blocked at the airport in Dar es Salaam.
Karua landed in Tanzania to appear for Tanzanian opposition leader Tundu Lissu in his legal proceedings.
Her travel documents were seized by the authorities.
Reacting to the events, Odhiambo argued it was unfortunate to have citizens' movement curtailed despite the right existing.
"This is quite unfortunate that though we should be enjoying free movement of persons within the East African region, Kenyans can be detained for merely being lawyers. I hope Korir Sing'oei can urgently intervene," the LSK president.
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Odhiambo's sentiments were underscored by her predecessor Nelson Havi, who called on President William Ruto.
He suggested the dismissal of Tanzania's ambassador to Kenya if the matter is not solved in good time.
"What is the purpose of the East African Community if Martha Karua is denied entry into Tanzania to practice law, and is instead deported? This is a matter that President William Ruto ought to take up with President Samia Suluhu, and if unresolved, expel the Tanzanian ambassador," Havi said.
This would not be the first case in which Karua is facing obstacles in a country in East Africa.
In January this year, she featured on the defence team of Ugandan veteran opposition leader Kizza Besigye.
Besigye was abducted from Nairobi and deported to Kampala in November last year.
He was detained and later charged with treason-related counts.
Karua, who had initially been barred from representing Besigye in the court martial, fought to have her licence approved.
She was later allowed to appear in court to defend Besigye.